nipper
2.We are specialized in Producing screwdriver,Screwdriver set, Ratchet screwdriver voltage tester,precision screwdriver, plier,long nose plier,bent nose plier,Diagonal cutting plier,linesman plier, mini plier,End nipper Plier,Joint type Plier,Pearl Nipper Plier,Extemal snap ring plier, Fishing Plier,Multi-purpose combination Plier,Heavry duty Pipe wrench , Wrench,Bolt cutter,and other combined tools.
3.This paper begins with an introduction of historical evolution of information technology and educational provision in general, followed by an exploration of concepts and theories of three generations of information technology and distance education, which were mainly proposed and developed by Garrison(1985), Nipper (1989)and Bates(1991).
